Flipkart Group CEO Binny Bansal resigned following an investigation by the parent company Walmart over allegations of "serious personal misconduct". Bansal's resignation was accepted with immediate effect.The surprise announcement by Walmart was followed by an email from Binny, denying the allegations, and the company board confirming Flipkart CEO Kalyan Krishnamurthy's induction as Flipkart's Group CEO. Here are some other top CEOs whose exits were shrouded by controversy